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Installation Manual 06/1995

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1. BEFORE SERVICING Bto oane INPUT CONDITIONING DF 2b 5 ra 1 ALARF HORN MODULE z e gt ASR 2 2 orate 5 Bh D my g 2 FOR PROPER INPUT 1 H 936 T fe maa CONDITIONING ONLY MCB tls a ra ALARM OUTPUT ONE SWITOH MAY qn gt MICRC Y BE IN THE ON b essere z PROCESSOR PL i at 9 ore ee gj CONTROL ci S73 SECCNDARY PUMP H 28m ajz aGARD 24 LIRA t e AR i Aopen T DUTPUT l 3 gee a a BIARD fH a BY PLO a B aes l a Or Cr 4 SECINJARY PUM 2 ICM ae a S 40 a nC P it H Y P peron TERMINGL lt 2 e AET ey SECONDARY PUMP e3 2 a oy rs zje PS ES ie 7 6 SECONDARY PUMP 4 Z TES U TR ae oo Yl anak aia oS l l T CTR 3 gt H Ag o f N oe el Gr 7 SECRONRY Pue 5 _ iz 16 XL r i tn P 7 x x a Me ma E B SECINDARY PUMP 6 Ha P NOTES L Fol er SONG WER man i 8 EUULING L L ALL EXTERNAL DIGITAL CONTACTS SHALL EE ee hast oe feos Ess ee SUITABLE FOR SWITCHING 24 VDL7S AC AND TEN LOW CURRENT APPROXIMATZLY 16MA ETA 10 COOLING TOWER Ke Ds z oh 2 USE TWO CONBUCTORSHIELCER TWISTED AND ANAI Nh Wi TPUTS Aire Ca a JACKETED CABLE WITH DRAIN WIRE ee gt eof 7 cra 11 CODLING TOWER 3 C3ELDEN NO 8762 OR EGJIVALENT c COCLING TOWcR VALVE 24 Kry yp tat d fb 4 255 ea 3 EACH OUTPUT CONSISTS DF A NOR
2. A CAUTION Static sensitive components A static discharge while handling electronic circuit boards can cause damage to the components Discharge any static electrical charge by touching the bare metal inside the control panel before performing any service work Never unplug any cables circuit board terminal blocks or power plugs while power is applied to the panel NOTICE This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with this instruction manual may cause interference to radio communications It has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment Operation of this equipment in a residential area is likely to cause harmful interference in which case the users will be required to correct the interference at their own expense McQuay International disclaims any liability resulting from any interference or for the correction thereof Page 4 IM 618 Applying the CSC The CSC has been designed to control several common chiller plant configurations Figure 1 shows a typical simple chilled water system Following are descriptions of this typical plant configuration and guidelines for applying the CSC in them Note that the McQuay chillers in these co
3. cccccccccssesessscseesseseseeesepereees 16 16 CSC Field Wiring Schematic eee 18 17 RS 232 Cable Pinouts for 9 Pin Serial Ports AMP Connector aenn a 19 18 RS 232 Cable Pinouts for 25 Pin Serial Ports AMP COnn CtOr iss a R 19 19 Cooling Tower Alarm Field Wiring Pell SAUUS CMY eser a Eaa 22 20 Analog Digital Input Field Wiring Connections 23 21 Analog Outputs Field Wiring Connections 24 22 AMP Connector Terminal Configuration 0 0 27 23 CSC Schematic Legend eeeseseeseessseeeessetees 29 24 GSC Schemat aeai e 29 25 MCB Power Supply Terminals 0 eeeesesesereeee 31 26 Output Board Relay Sockets 0 0eee eee 33 27 Testing a Typical Relay Circuit ees 34 28 Testing a Relay Circuit with a Disconnection 34 Tables 1 MicroTech Unit Controller Installation Literature 4 2 MicroTech Unit Controller Operation Literature 4 3 Model Specific Chiller Installation Literature 4 4 Green and Red Status LED Indication 9 5 Amber Status LED Indication eeeennnren 9 6 Analog Inputs Field Wiring Terminal Strip Number 10 7 Digital Inputs Field Wiring Terminal Strip Number 10 8 Program Code CSC1 01A Software Compatibility 12 9 Accessories Installation Manuals 00000 c ceee 13 10 PG Specification cecidi iaasa aea arean 14 11 CSC Environmental Specifications 0000 00000
4. Common rr Ea 7 T l I 1 CT PANEL POWER BEFORE SERVICING INPUT CONDITIONING MOOULE 2 FOR PROPER INPUT THE ON POSITION T1 T2 gee Analog Outputs The CSC provides analog output signals from the MCB s Expansion Bus Connector to the Analog Output Expansion Module AOX 4 via a ribbon cable The AOX 4 provides a variable voltage or current control signal to the output de vices and is powered by the CSC s 13 Vdc power supply For more information on the AOX 4 see Bulletin No IM 607 MicroTech Analog Output Expansion Module or refer to the Analog Output Expansion Module in the Acces sories section of this manual Note All analog outputs have fixed locations see Figure 16 CAUTION Ground loop current hazard Can cause equipment damage Analog output signals voltage mode must be isolated from any ground other than the MicroTech controller chassis ground If they are not ground loop currents could occur which could damage the MicroTech controller Digital Input Device External Start Stop Return Line Communication Ports Terminals A A G B B G Cooling Tower Bypass Valve The CSC controls a bypass valve to maintain the either the entering or leaving condenser water temperature at the Valve Setpoint or the Stage Setpoint when condenser flow is confirmed Chilled Water Loop Bypass Valve or Secondary Pump VFD The CSC modulates a chil
5. Error Code reads Does not respond a communications problem has occurred For more on network diagnos tics see Chapter 5 Comm Menu in MicroTech Mon itor for Windows user s manual If a communications problem occurred check the following items e Make sure the hex switches on each controller are set to the correct values e Make sure the controller has power supplied to it e Make sure the communication line is properly con nected to port B e Make sure the controller is level 2 by directly con necting the PC to it You must know how to change communications passwords to do this 7 Go to the next controller and repeat steps through 6 Do this for each controller being connected to the network Note To verify communications more quickly and easily use two people in the commissioning of the network Be cause some jobs have units located throughout a building having one person perform the commissioning procedure may be difficult When there are two people one person can stay at the PC connected to the level l controller and the other person can go to each individual unit controller Using a radio or other two way communication equipment they can indicate when a specific controller is connected and whether communications between the controllers is occurring Service Information Wiring Diagram The following wiring diagram is identical to the one in the Figure 23 CSC Schematic Legend CS
6. internal time clock battery backed Super VGA graphics capabili Super VGA monitor Bus mouse or trackball 101 enhanced keyboard 9600 baud modem compatible with the AT command set optional MS DOS 6 2 or higher Microsoft Windows 3 1 or higher MicroTech Monitor for Windows software AAi ikd a E e EE E a e e EAE S AE E ENE EESE Internat time clock battery backed COA MS DOS 5 0 p Network Master Panel The Microtech Network Master Panel NMP allows the CSC and its associated units to be incorporated into a building wide network with other MicroTech unit and auxil iary controllers In conjunction with a PC and Monitor soft ware it gives the building operator the capability to perform advanced equipment control and monitoring from a central or remote location The following features are provided by the optional NMP Remote unit monitoring Advanced scheduling features Advanced alarm management Global operator override by unit type Demand metering Historical electrical data logging Open Protocol MicroTech Open Protocol provides an interface between the CSC and the building automation system of one of many participating manufacturers With Open Protocol the building automation system can do the following e Monitor CSC schedule statuses e Monitor most controller setpoints parameters and alarms e Set most controller setpoints and parameters e Set up multiple unit control groups In an Open
7. the CSC will begin the Start Up of the chillers when the external input is closed The CSC will begin the shutdown of the chillers when the exter nal input is open IM 618 Page 21 Chilled Water Reset Override Optional Chilled water reset override is an option that allows the CSC to override the any reset method that is being used When the chilled water reset override input is closed the chilled water supply setpoint will be set to an adjustable minimum value Cooling Tower Alarm Optional The cooling tower alarm is an option that will notify the CSC that an alarm has occurred on a cooling tower device A double pole double throw DPDT relay minimum power usage of 30 mA is required for each output device e g fan that could fail when the cooling tower alarm input is to be used Note that the relay is field supplied The DPDT relay is field wired to the CSC s output board see Digital Outputs in this manual for more information about the Output Board Figure 19 shows a cooling tower alarm field wiring dia gram which will alarm a fail status only The figure includes two cooling tower outputs Note that up to twelve cooling tower outputs can be wired for cooling tower alarms Figure 19 Cooling Tower Alarm Field Wiring DPDT relay field supplied TC1 Wire relay lo Digital Output 10 Tower Output X2 To Tower Device Alarm Circuit __ To Digital Input 2 DI 2 p emes 120 and 121 Cool
8. zZ om x G oa RUNNING CPU RESET STATUS ACTIVE OUTPUT 0 Y Microprocessor status LED s POWER FUSES BUSSMAN GDC T2A 18 24 VCT AC AC GND GND DIGITAL OUTPUTS Y ANALOG INPUTS Digital Inputs Connection The MCB receives digital inputs from the Input Conditioning Module ICM Terminal Board through the Digital Inputs connector via a plug in ribbon cable These inputs are conditioned by the ICM See Input Conditioning Module ICM in the Accessories section of this manual for more information on the ICM Analog Inputs Connection The MCB receives conditioned analog inputs from the Input Conditioning Module ICM Terminal Board through the Analog Inputs connector via a plug in ribbon cable These inputs are conditioned by the ICM After having been condi tioned all analog inputs enter the MCB through the Analog Inputs port as O 5 Vdc signals See Input Conditioning Module ICM in the Accessories section of this manual for more information on the ICM Digital Outputs Connection After processing all input conditions and network data the MCB sends the appropriate output signals to output devices through the Digital Outputs port via a plug in ribbon cable Aux Out Terminal Strip The Aux Out terminal strip provides 5 Vdc and 13 Vdc to the CSC field wiring terminal strip The 5 Vdc powers the back light of the LCD or other auxiliary equipment The 13 Vdc can be used to power a mod
9. As shown in Figure 8 field wiring to port B on these controllers can be accomplished by connecting the network cable to terminals B B and GND in the CSC terminals 84 85 and 86 in each 200 series centrifugal chiller terminals 137 138 and 139 in each reciprocating chiller and terminals 53 54 and 55 in each screw chiller Note that the chiller designations shown in Figure 16 Chiller 1 through Chiller 4 are established by the network address not the physical position of the unit in the daisy chain The networked controllers can be wired in any order For example the CSC could be connected between Chiller 1 and Chiller 2 It is high y recommended thaf the installing contractor keep track of the physical order of the controllers on the daisy chained trunk This will facilitate troubleshooting any network communications problems that may occur For more on the network address see Addressing the Controllers in the Network Commission ing section of this manual Use the following procedure to perform the network wiring 1 Before beginning verify that the port B plug is discon nected from every controller on the communications trunk being wired These plugs will be connected dur ing the commissioning procedure This precaution pre vents stray high voltage from damaging the controllers Any voltage more than 12 V can damage the board s communications drivers 2 Connect the network cable in a dai
10. DI 3 DO 12 36 Secondary Pump 2 status Di4 D013 Z e T 5 z Secondary Pump 3 ae f aT econdary Pump 3 status 3 DIS DO 1 EB i cena lianll Sia aeiaiaiatel ed attire Secondary Pump 4 status gt DI6 DO 1 39 e os a em Secondary Pump 5 status DI7 DO 1 ae TRE _J emma enor 39 41 eaae Secondary Pump 6 status T Optional PC LL SS Display Proc series 200 centrifugal series 100 centrifugal shown see note 3 reciprocating shown shown Chiller 2 screw shown Chiller 3 Chiller 4 Chiller 1 Page 18 IM618 115 Vac power Alarm LED Alarm Horn Alarm Output Secondary Pump 1 Secondary Pump 2 Secondary Pump 3 Secondary Pump 4 Secondary Pump 5 Secondary Pump 6 Cooling Tower 1 Cooling Tower 2 Cooling Tower 3 Cooling Tower 4 Cooling Tower 5 Cooling Tower 6 Cooling Tower 7 Cooling Tower 8 Cooling Tower 9 Cooling Tower 10 Cooling Tower 11 Cooling Tower 12 Cooling tower bypass valve Loop pressure bypass valve or Secondary VFD pump 1 Secondary VFD pump 2 ee To Chiller 5 8 and or Network Master Panel Notes 1 The chilled water supply sensor is required for any application of the CSC Other output requirements will be determined by how the CSC is applied 2 The following power supplies are available for field use at terminal strips T7 T8 and T9 not s
11. ICM Terminal Board the ICMs if any the connecting ribbon cable and the field wiring for shorts Any of these may be defective Try repeating this step after removing or swapping ICMs Reconnect the digital output ribbon cable to the MCB Cycle power to the controller and check the power fuses If both fuses are intact go to step 9 If either fuse blows check Output Board and the connecting ribbon cable Either of these may be defec tive If there are any AOX4 boards reconnect the expan sion bus ribbon cable to the MCB otherwise go to step 10 Cycle power to the controller and check the power fuses If both fuses are intact go to step 10 If either fuse blows check the analog output ex pansion modules if any the connecting ribbon cables and the field wiring for shorts Any of these may be defective With circuit breaker CB1 open measure the resistance between field terminals DC GRD and 5 Vdc It should be greater than 20 ohms If the resistance is greater than 20 ohms go to step 11 if the controller is equipped with at least one AOX4 board or a modem Otherwise the problem is indeter minate Obtain factory service If the resistance is less than 20 ohms it is likely that the keypad display the Output Board the ICM Terminal Board or an external field supplied load is exces sively loading the MCB s 5 Vdc power supply Isolate the problem by taking resistance measurements on each of these dev
12. Protocol application that includes a CSC the MicroTech Open Protocol Master OPM Panel is not re quired because the CSC performs its functions For fur ther information contact your McQuay sales representative If a serial pointing device is used there must be another serial port available for connecting the PC to the MicroTech controller Page 14 IM 618 Installation Panel Location and Mounting The CSC is suitable for indoor use only Table 11 lists the Table 11 CSC Environmental o allowable temperature and humidity ranges Locate the g me panel at a convenient height and allow adequate clearance ae uae for the door swing Mount the panel to the wall with screws Opera or bolts Four 14 inch openings are provided at the corners of the panel The panel weighs approximately 60 Ibs 27 kg Figure 13 shows the panel dimensions The CSC is equipped with special door hinges that have a friction adjustment screw By adjusting this screw you can prevent the panel door from swinging open or closed unexpectedly 30 100 F x 38 C 10 95 aacer denen 0 125 F 18 52 C 10 95 noncondensing Figure 13 CSC Dimensions Hinge friction adjustment screw 7 8 22 3 Dia knockouts 1 4 6 4 Dia mounting slots 2 E59 24 610 a 1 4 6 4 Dia mounting slots 2 1 3 4 4 eae 3 PRO 102 408 102 4 3 4 O00000G Se 121 610 Left Side View Front View Right Side V
13. SAn control comcvanpenaiweme MRONO AA AAA akae E Optima start aaa jv fet jt t E RF eae a We a Nontimed scheduie override Notes 1 Cooling tower staging and cooling tower bypass valve control require either a leaving condenser water temperature sensor or an entering condenser water temperature sensor 2 The CSC can also get the outdoor air temperature via network communications from a Network Master Panel or a building automation system with Open Protocol Analog Inputs Chilled Water Supply Temperature Sensor When connecting any analog input device to the CSC the field wiring connection is made at the ICM Terminal Board imma WAliviam bambon mtima anlaa Tahla 49 ahaa SES vining inSduUcions DHEeiow 1 amp 0 ic SNOWS Seve CSC features and their required analog inputs Note All analog inputs have fixed locations see Figure 16 AL DJEN Ground loop current hazard Can cause equipment damage External 4 20 mA signals must be isolated from any ground other than the MicroTech controller chassis ground If they are not ground loop currents could occur which could damage the MicroTech controller lf the device or system providing the external signal is con nected to a ground other that the MicroTech controller chassis be sure that it is providing an isolated output or condition the output with a signal isolator Page 20 IM 618 The common chilled water supply temperature sensor is used when standar
14. When using return chilled water temperature reset the System Setpoint is determined by the common chilled water return temperature When using the constant return chilled water tempera ture reset the System Setpoint is reset by a constant return Change and Wait function to maintain the common chilled water return temperature Condenser Water Temperature Sensors The condenser water temperature sensors are used for cooling tower staging control and cooling tower bypass valve control When cooling tower stage control is required the first tower stage will be turned on when the common entering condenser water temperature exceeds the Stage 1 Setpoint adjustable on the CSC s keypad menu 18 or using Monitor software When cooling tower bypass valve control optional is used the CSC will maintain the common entering con denser water temperature at the Valve Setpoint or Stage Setpoint adjustable on the CSC s keypad menu 18 or using Monitor software Note Cooling tower staging control and cooling tower bypass valve control each require either a leaving con denser water temperature sensor or an entering condenser water temperature sensor Outdoor Air Temperature Sensor The outdoor air temperature sensor is used to reset each chillers leaving evaporator water temperature setpoint to equal the common chilled water supply temperature Decoupler Temperature Sensor The decoupler temperature sensor is used when decoupled chiller se
15. isolate the problem 1 Remove power from the controller by opening CB1 Pull the solid state relay from the suspect output s socket 2 Restore power by closing CB1 If the output load remains energized when there is no relay in the socket the output s MOV has failed and thus the Output Board must be replaced If the output load de energizes the relay that was pulled is defective Contact Chatter Contact chatter is very rapid opening and closing of con tacts It is usually caused by low voltage at the electrome chanical relay or contactor coil If contact chatter is occurring on a relay or contactor connected to one of the Output Board solid state relays it is also possible that a faulty connection exists on the power supply terminals of the Aux Out plug connector on the MCB on the CSC field wiring terminals on connector H7 of the Input Conditioning Module Terminal Board or the wiring between the Input Conditioning Module Terminal Board T10 and the Output Board In very rare instances contact chatter can be caused by a faulty solid state relay Perform the following procedure to isolate the problem 1 Verify that the voltage at the load s power supply and at the solid state relay contacts is adequate 2 Remove power from the controller by opening CB1 Swap the suspect relay with a known good relay Try to choose a relay that will not affect unit operation Re store power by closing CB1 If the chatter does not
16. tem Setpoint adjustable on the CSC s keypad Menu 17 or by a PC using Monitor software If the external reset signal equals 20 mA 5 Vdc the System Setpoint will equal the Maximum System adjustable on the CSC s keypad Menu 17 or by a PC using Monitor software For more on reset refer to Reset in the Chilled Water Temperature Control section of Bulletin No OM 127 MicroTech Chiller System Controller Analog Inputs Cable Specifications The cable for analog inputs must meet the following mini mum requirements twisted shielded with drain wire 300 V 60 C 20 AWG polyethylene insulated with a PVC outer jacket Depending on the application either two conductors Belden 8762 or equivalent or three conductors Belden 8772 or equivalent are required Note that some local codes or applications may require the use of plenum rated cable Do not install the cab e in the same conduit with power wiring Digital Inputs When connecting any digital input device to the CSC the field wiring connection is made at the ICM Terminal Board see Wiring Instructions below Table 12 shows several CSC features and their required or optional digital inputs Note All digital inputs have fixed locations see Figure 16 External Start Stop External start stop is used when nontimed schedule over ride or external timeclock scheduling is required Using nontimed schedule override manual switch or external timeclock scheduling
17. water temperature setpoint if all the chillers are on If some chillers are on and some are off the CSC will lower each chillers leaving evaporator water temperature setpoint to compensate for water mixing Page 6 IM 618 Figure 2f Above Configuration with Common Primary Pump and Isolation Valves Chiller s MA Pad DO K In the configuration of Figure 2f the chilled water supply temperature will always be very close to each chillers leaving evaporator water temperature setpoint Caution Significant changes in the chilled water flow rate through the evaporators can result when the chillers in the configuration of Figure 2f are turned on and off Large flow rate changes can cause erratic chiller control Secondary Pump Decoupler Line Configuration Figures 3a 3d represent the four secondary pump control options available using the CSC Figure 3a Fixed Speed Secondary Pump Uni directional flow meter supply to return Differential pressure transducer Uni directional flow meter supply to return ey Variable frequency drive z Decoupler line temperature y s A gt Using the variable speed secondary pump will maintain a desired pressure across the chilled water loop Note A pressure controlled loop bypass Figure 4 may not be used in conjunction with a variable speed secondary pump Figure 3c Lead Standby Secondary Pumps Uni directional flow meter supply to return Using the lea
18. 00 baud For more information see PC Connection in the Field Wiring section of this manual Port B Port B is for Microtech network communications using the RS 485 interface standard A twisted shielded pair cable should be connected to port B via terminals B B and GND on terminal block T1 The communications rate is 9600 baud For more information see Network Communications in the Field Wiring section of this manual Output Board The Output Board OB accepts up to 24 digital outputs from the MCB Each output has fused sockets and can be used to switch AC or DC power by selecting a particular relay output module Screw terminals allow for field wiring connections to the output device Each output has an on board LED that illuminates when an output socket that contains a relay is activated by the MCB Following are the Output Board s power ratings e 120V 50 60 Hz e 250V 50 60 Hz Page10 IM 618 Input Conditioning Module Terminal Board The Input Conditioning Module ICM Terminal Board allows the transfer of up to 24 analog and 24 digital conditioned inputs to the MCB The ICM Terminal Board has three edge card connectors field wiring terminals for analog and digital inputs field wiring terminals for 5 Vdc and 24 Vac field wiring terminals for communication ports and ribbon cable connections to the MCB The ICM Terminal Board edge card connectors accept up to three Input Conditioning Module
19. 15 12 Analog Digital inputs and Outputs 00 ce 20 13 Port B Voltages AMP Type Connector 0 27 14 Network Communications Field Wiring Terminals 27 IM 618 Page 3 Introduction This manual provides information about the MicroTech Chiller System Controller CSC for McQuay centrifugal me meee Tm EPT m series 100 and 200 reciprocating and screw chillers It describes the components field wiring network commis sioning procedures and service procedures For information about the CSC s features sequences of operation and programmable options refer to Bulletin No OM 127 MicroTech Chiller System Controller For specific information about the MicroTech chiller controllers refer to the appropriate MicroTech unit controller installation litera ture or operation manual see Tables 1 and 2 For installa tion and commissioning instructions and general informa tion on a particular unit refer to its model specific installation manual see Table 3 ee Bees et PEER SDE ALR 40 195 tons PIM Table 1 MicroTech Unit Controller Installation Literature Chiller Type letin bi a Reciprocating A WARNING Electric shock hazard Can cause personal injury or equipment damage This equipment must be properly grounded Connections and service to the MicroTech contro panel must be performed only by personnel that are knowledgeable in the operation of the equipment being controlled
20. 3 MODULE 139 j 155 171 187 108 124 2FORPROPERINPUT 1404 156 172 188 Am Al 4 f DI 4or TCH CANGE IN aaa Al 12 DI 12 arm tA Al 20 H DI 20 1400 Me lt 0 THE ON POSITION 141 19 t3 LM 110 1 ars pi 2 126 142 18 as oat 158 174 1 190 111 J 1z 143 159 175 21 E O12 191 112 l ay H1 RAE 128 144 160 176 H3 192 S Al14 D14 ES d E _ Baaz D228 113 129 145 i 161 Communication 177 w 1 j193 n 114 Ql 712 ne 130 146 162 Ports Terminals 178 res 194 bate Al 15 D115 loleleleale A123 9 p23 hee 115 131 LSS bes Vien QE Ka S 147 9163 hea G BeB G E Teg gt Ti T2 T3 T4 T5 a as A m i a Keypad Display Interface The Keypad Display Interface KDi see Figure 9 gives you a local interface with the CSC All operating conditions system alarms control parameters and schedules can be monitored from the display If the password has been en tered any adjustable parameter or schedule can be modi fied with the keypad Because the display is backlit the liquid crystal characters are highly visible regardless of the ambient light level You can adiust the display contrast with a small pot located on the back of the board An Alarm LED and Alarm Horn are also located on the KDI For informa tion on using the keypad display refer to the Getting Started portion of Bulletin No OM 127 MicroTec
21. C It is reproduced here for your convenience The wiring r diagram in the CSC will have the locations of analog inputs 4 and outputs and digital inputs and outputs It is reproduced Feer ane Circuit Breaker here for your convenience The legend is shown in Figure TAE EOS Microprocessor Control Board 2 l PCGM ae nn Input Conditioning Module KAEA Output Board aT Auxiliary Output Expansion Board Keypad Display interface EE EESE Transformer 115 24 Vac NE ENRE Transformer 24 Vac 18 Vac CT Factory Wire Number Field Wiring Terminal Field Wiring Printed Circuit Board Terminal Twisted Shielded Pair Cable Figure 24 CSC Schematic 4OT 15 VILTS 47 NEUTRAL CRD e ii ie ao o E S PORER SRP UY IH o men D FUSED 15 A PS tl mn RES L2 Ge BUK fo th weil Mo CB Not RN O F sna 05 AHP 17 a OOIAV v So ry e 9D a3 se 7 DS a na oe ANALOG INPUT SIGNAL 1 e ee m A a SWITCH CONFIGURATION H a Ht 933 aed eae gn NNA q END 24v zepa 999 SEE NOTE 9 DIGITAL CJTPU S 1 gis PN O 1ov He E g y 33 f iry ce a a 7 Ag i ee ae ae j ae p seli ger gt f CS NOTES Has Sae a8 aan Oe i p H aaa a as m os DISCONNEC PANEL POWER
22. ED and Alarm Horn Both the Alarm LED and Alarm Horn are internally wired to DO 0 and DO 1 They are not intended for field wiring how ever they can be wired to by installing a relay in the socket Alarm Output The alarm output is used for remote alarm indication location of an alarm output in a separate location than the CSC Secondary Pump 1 The secondary pump 1 digital output is used to start and stop the secondary pump 1 When the proper digital out put signal is sent by the CSC through the secondary pump 1 digital output the secondary pump 1 will start Secondary Pump 2 6 The secondary pump 2 6 digital outputs are used if needed to start and stop the secondary pumps 2 4 6 When the proper digital output is sent by the CSC through the secondary pump 2 6 digital outputs secondary pumps 2 6 will start Cooling Tower 1 The cooling tower 1 digital output is used to start and stop the cooling tower fan 1 or other device When the proper digital output is sent by the CSC through the cooling tower 1 digital output cooling tower fan 1 or other device will start The CSC will control the tower fan 1 or other device by using the cooling tower staging control feature Cooling Tower 2 l 2 The cooling tower 2 I 2 digital outputs are used to start and stop the cooling tower fans 2 through 12 When the proper digital output is sent by the CSC through the cooling tower 2 12 outputs cooling tower fans 2 through 12 will
23. Installation and Maintenance Data Bulletin No IM 618 June 1995 Part No 585519Y 01 International MicroTech Chiller System Controller For Use with McQuay Models PEH PFH ALR WHR ALS amp PFS Contents IUOOUCHONN aosa ten naatnanisoiens 4 ADDIVING Me CSG siesena E NEN 5 General DeSCriptiOn ec cccecececceceeeeseeereneeeeenenen 8 Component DAA ices actos cs het ceaticaanineecianianlsucacracbanuwaueeds 8 Microprocessor Control Board cccccceeeeeeeees 9 Output Board aiio manana TA 10 Input Conditioning Module Terminal Board 10 Snap TACKS oai ra a ie eae eeeede tee ade 10 Keypad Display Interface 0 ce cccecesseeesesererens 11 Sotware ID nasuri a A 12 Software Compatibility sessssessessesessersrrrerererreersrss 12 PCCCSSONGS aera A a 13 Input Conditioning Module eens 13 Analog Output Expansion Module 13 Solid State Relay Kilica eie 13 Modem Ki aie N E teicher cel oreo tenes 13 MicroTech Monitoring and Networking Options 14 PO MONNOFING eiorinn R A Mua 14 Network Master Panel 0 ccccecceeceeeeeeeeeeeeeeeeeeeeeaees 14 BET Protocol startin ce siditokignied taasiccns E EENS 14 instalation E t5 Panel Location and Mounting cc 15 Sensor Installation pices cescssasutivonndsaxrendotersseciarecevedenoneencnsiers 16 RIO WINING eae nar E E N 17 FOWE ora T A 17 Network Communications
24. MALLY CPEN CAILL WIR PRI 3 VALVE Sa yot TOM SOLID STATE RELAY AND A REPLACABLE 2 AM NR SECONDAR VFD PUMP H zg Era jo Oe I SEA FUSE LOAD CURRENT RATING IS 2 AMPS AT 6CC 7 apne SFT FOR LIAD VOLTAGE RATING SEE INFORMATION 2 SECINJA Y VET CJM HHA P THAT IS SUPPLIED WITH SOLID STATE RELAY KIT ea E 13 COOLING TOWER 5 28 CY A ICML IS INSTALLED IN THE CSZ PANE Yta a Sa 1 i OOO OTHER CM AND AOX CIRCUIT BOARDS ALONG Bat 14 COULINO UWER 6 WITH SOLID STATE RELAYS ARE SEPARAT ma es Ere LA LOU ee M ACCESSORIES THAT ARE ORDERED FROM THE E at FACTCRY AS NEEDED THEREFIRE THIS PANEL Timia Z E ea MAY CR MAY NO HAVE ALL THE TEMS THAT eel aos 1 S COOLING OWER 7 ARE SHOWN JN THIS SCHEMATIC 32 ig 3ig Seiad t S IF COOLING TOWER ALARM IS NDT USED p S Fy ra 16 COOLING TOWER 8 TERMINALS 120 AND 121 MUST BE JUYPIRED vee bey TR See Say Gece sae pA oe 17 COMING IWER 9 7 g E o Q Sh a ar eee o lt oo 4 for 3 o bir i u 2 fy 18 COOLING TOWER W0 76 5 SEE phe aa Aare Be yt pages nae nk EZ 19 COCLING TOWER HI 4 i eac ADX 2 yg Sa aE aes er aR 24 gt Cra ap l 1 15 a See F BRD Sj RRR css x3 2C COULINN DOWER HE 2 ra vet G ae ae at re Ores on 3 i Se io Cae lat 21 THLSE WIRES ARE Fal a Ri El SUPPLIED WHIP agx RIRCUN j j KITS BUT NEEL TO BE x TO CONNECTED IN THE FIELD NS SEE NITE 4 lt 22 Beek Pens Sees 535 e
25. MP 3 m SEE 245 Ea OWER SDC Q4 FAR FIELD SG Bpo Ez 332 cae LOS Ses BS i B CHILL WIRRESET 33 i49 g e e B SECINEARY PUMP th i34 150 24 s 9 DEMAND LIMIT Ll 135 BL ot 2 nnn 2 7 f 136 Ise 2 LE 2 aea th e a 137 i 153 t ee eats ait 7 138 jo 154 ine I ce She ice ae Pte he 139 155 e 1 ae 14C M 156 ee eae pce re ees 2 141 157 eee nee 142 Z 158 VS see tse oa on Son et MS 143 189 13 oe 144 160 0 14 145 T 161 14 145 l 162 ID aa gi e 147 163 1h lt a SE Eod NOTE 4 pme 7 SEE NOTE zaco l see PL WER SDC j CR FJELD 36 y t SEE else Jat NOTE i niea oei SARRE 4 se 13V DC 0 RE PORT A 2 1 WHT ig 3 BLK a b 5 ae E T PHONO LINE RI 1 0 PHONE JACK UNNEC TION CONNECTION MCJDE M m ts PHONE MODEM OPTION Page 30 IM 618 Red LED Remains On If the red LED remains on after the 5 second self test pe riod it is likely that the MCB is defective However this can also occur in some instances if there is a power supply problem Refer to Troubleshooting Power Problems below Red and Green LEDs Off If the red and green LEDs do not turn on after power is applied to the contr
26. Module ICM or a digital input device Swap these components sepa rately to isolate the problem Remove power from the controller before disconnecting the suspect compo nent and restore power after connecting the replace ment component If the problem persists it is likely that the MCB is defective Troubleshooting Analog Outputs Variable voltage or current control signals are sent to ana log outputs by the MCB through the Analog Output Expan sion Module AOX 4 The MCB sends a voltage or current signal to the AOX 4 via a ribbon cable Jumpers on the AOX 4 determine what type of output will be sent to the analog output device The analog output signals are sent from the AOX 4 by connecting a two pin Phoenix connector to the Analog Output Ports on the AOX 4 The analog out put device also has an external power supply usually 24 Vac that is not powered by the CSC Analog Output Device is not Operating Correctly If the MCB appears to be functioning properly and the analog output device is not operating correctly perform the following procedure 1 Try cycling power to the controller by opening and then closing circuit breaker CB1 2 Check the ribbon cable s power wiring from CSC to the AOX 4 field wiring connections from the AOX 4 to the analog output device and the power wiring from the external power supply to the output device Look for bent pins cable on backwards or miswires Restore power after reconnecting all c
27. No NMP If two or more CSCs are included in a network that does not include an NMP one of the CSCs must be the level l con troller In this case the other CSCs are level 2 controllers and the unit controllers are also level 2 controllers The level CSC s hex switch setting must be 00 The hex switch settings of the level 2 controllers must start at 01 and con tinue consecutively to a maximum of 40 64 decimal There must be no gaps in the sequence and no duplicate settings As long as these rules are followed a level 2 controllers hex switches can be set to any value Page 26 I IM 618 For example assume that a MicroTech network includes two CSCs and ten centrifugal chillers Each CSC will control and monitor a separate system of five chillers One possible addressing scheme is as follows Hex Switch Setting Controller 00 csc A 01 csc B 02 Chiller 1 for CSC A 03 Chiller 2 for CSC A 04 Chiller 3 for CSC A 05 Chiller 4 for CSC A 06 Chiller 5 for CSC A 07 Chiller 1 for CSC B 08 Chiller 2 for CSC B 09 Chiller 3 for CSC B OA Chiller 4 for CSC B OB Chiller 5 for CSC B Note The only advantage to creating a network like this is to allow a PC access to all networked controllers If there is no PC each CSC should be set up as a level I controller in a separate network as described above in The Typical Network Note If a PC or modem is connected
28. ables and wires Note If the analog output signal supplied by the CSC is a voltage signal O 5 O 10 Vdc the external power supply ground must be grounded to the Micro Tech Controllers chassis ground 3 If the problem persists try Swapping a known good AOX 4 ribbon cable s analog output device or exter nal power supply Swap these components separately to isolate the problem Remove power from the control ler and analog output device before disconnecting the Suspect component and restore power after connect ing the replacement component If the problem per sists it is likely that the MCB is defective Troubleshooting Output Boards Each output on the Output Board consists of a solid state relay an LED 5 amp fuse and an MOV metal oxide varistor Normally when the MCB commands an output to ener gize the solid state relay contacts will close and the LED will glow The contacts of each solid state relay are in se ries with a 5 amp fuse These fuses resemble small resis tors and are located on the board adjacent to the relays they serve see Figure 26 The fuses are pressed into place They can be removed with a needle nose pliers The MOV which is located on the underside of the output board protects the solid state relay from high transient voltages MOVs are part of the output board and cannot be replaced Following are troubleshooting procedures for various symptoms of output board problems Note It should be p
29. aisy chain wiring is shown in Figure 16 Net work communications is accomplished using the RS 485 interface standard at 9600 baud About Microtech Network Architecture All controllers in a MicroTech network are assigned a level level 1 level 2 or level 3 All networks must have one level l controller to coordinate communications Mul tiple level 2 controllers connect to the level i controller with a communications trunk an isolated section of the daisy chained network wiring In Figure 16 the network wiring between all controllers is a trunk Multiple level 3 controllers can be connected to a level 2 controller with a separate trunk The maximum allowable length of a communications trunk is 5000 feet Cable Specification The network communications cable must meet the following minimum requirements twisted shielded pair with drain wire 300 V 60 C 20 AWG polyethylene insulated with a PVC outer jacket Belden 8762 or equivalent Some local codes or applications may require the use of plenum rated cable Do not install the cable in the same conduit with power wiring Note Ideally one continuous piece of cable should connect any two controllers This will reduce the risk of communications errors If the cable must be spliced use crimp type butt connectors good or solder best Do not use wire nuts Wiring Instructions The network connection to the CSC and unit controllers is at port B on their MCB boards
30. als 5 0 ee 53 DRS I D9 NACI DIC hae i Dob Ora Kee jdi e E R EE ome EREE E Se i Input Conditioning Module ICM Analog Output Expansion Module AOX 4 Solid State Relay Kit SSR Input Conditioning Module The Input Conditioning Module ICM see Figure 11 al lows the user to add eight analog and eight digital inputs to the CSC The ICM is inserted into the edge card connector on the ICM Terminal Board A maximum of three ICMs can be used on the CSC providing up to 24 analog and 24 digital inputs An input conditioning switch on the ICM selects what type of analog input is needed Following are the four types of analog inputs available e 3K Q thermistor e 4 20 mA signal 4 wire type e O 5 Vdc signal 1 5 Vdc actual e O l 0 Vdc signal 2 10 Vdc actual The digital inputs must be a dry contact closure When contact closure is made an LED on the ICM illuminates indicating which input is active For more information on the Input Conditioning Module ICM see Bulletin No IM 605 MicroTech Input Conditioning Module Figure 1 I Inout Conditioning Module ICM a OOOO OOOO RUHL ee ed crores e ESFE a Analog Output Expansion Module The Analog Output Expansion Module AOX 4 see Figure 12 provides variable voltage or current output control sig nals from the CSC to two different current and voltage ranges The AOX4 is inserted into the sn
31. ap track of the CSC Up to three AOX boards can be installed providing a maximum of 12 output channels Jumpers on the AOX4 allow the user to configure the output ports to one of the following current voltage selections e O 5 Vdc 0 10 Vdc e 0O 5mA e 0 20mA For more information on the Analog Output Expansion Module see Bulletin No IM 607 Microtech Analog Output Expansion Module Figure 72 Analog Output Expansion Module AOX 4 o Nc n POWER 26 pin Expansion OK BAD Bus Connector AD L Power LEDs 26 pin Expansion Analog Switch Bus Connector Selectors AC AC DCG a TTD o Power Connector Analog Output Ports T Be Solid State Relay Kit The Solid State Relay Kit consists of a package of eight AC power rated output relays The relays plug into the 24 channel Output Board OB in the CSC If other types of relays are needed such as dry contact or DC power rated they can be ordered as individual units see Parts List For more information on the Solid State Relay Kit see Bulletin No IM 606 MicroTech So id State Relay Kit Modem kit The Modem Kit allows communications between a Micro Tech controller or network of controllers and a remote or off site PC The modem kit contains a 14 4K baud rate modem and an interface cable that connects directly to port A of the controller For more information on the Modem Kit see Bulletin No IM 564 MicroTech Modem Ki
32. ations can be verified by using the CSC s keypad display However if you want to use a PC to verify network communications you can The PC must be equipped with MicroTech Monitor software Note The term HVAC equipment refers to the different McQuay and AAF brand products monitored and con trolled in a MicroTech network Addressing the Controllers For network communications to occur each controller in the network must have a unique network address A controller s hex switch setting defines its network address The hex switch setting is determined by the project engineer or the customer The engineer or customer should prepare a schedule indicating what the hex switch settings on each controller should be The schedule should then be given to the commissioning technician or engineer so they can set up the software For more on hex switch settings see Microprocessor Control Board in the Component Data section of this manual After changing a hex switch setting power to the MCB must be cycled to set the new address into memory In the CSC this can be done by pressing the ON OFF switch CB1 to the OFF position and back to the ON position In the unit controllers this can be done in a variety of ways Refer to the individual installation manuals for more infor mation on cycling power to the MCBs A level i controller will have a hex switch setting of OO The level 2 controllers will have hex s
33. cc cccccececeeeeeseeeneeeeees 17 PG COMMEGCTION isir eea waits 19 Analog PUTS sesso ss cc chsh cei eect ee toad EA 20 Digtal NOUNS anacancnan aa a 21 PING OG OUMU arsena E AAS 23 Digital QPU nrnna i AA iS 25 Network COMMISSIONING sesssesssessrsrsrensrsrersrersessrerereresrnes 25 Addressing the Controllers 2 0 0 0 cceecceseseceeeeeeeees 25 Minimum Controller Setup ce ccececesceeeeereeeneeeees 26 Connecting the Communications Trunk 26 Service Information cceeecececcececeseneeenerceserens 29 Wirmg DIB ONAN esrara iat 29 TESt Proceduro S esis aT 30 Status LED Diagnostics 0 cece ceeeceeeeeeeeereeeeeeeees 30 Troubleshooting Power Problems eceeeeseeeeees 30 Troubleshooting Communications Problems 31 Troubleshooting the Keypad Display Interface 31 Troubleshooting Analog Inputs ce eeeeeeeeereeeee 32 Troubleshooting Digital Inputs 0 ee eereeees 32 Troubleshooting Analog Outputs eee ee eee 32 Troubleshooting Output Boards cece renee 33 Troubleshooting Solid State Relays 34 MCB Replacement vccicccsaieein tonite eneennert 35 Parts LIST ananena E aut 35 Page 2 IM 618 McQuay and MicroTech are registered trademarks of McQuay nternational Monitor and Open Protocol are trademarks of McQuay International Microsoft and MS DOS are registered trademarks of Microsoft Corporation IBM is a registered trademark of international Busine
34. cled in order to enter the new setting into memory This can be done by turning the panel s power switch off and then back on Figure 7 Hex Switches HI left hex switch LO right hex switch Hex switch setting 01 shown Expansion Bus Connection The Expansion Bus connector sends output signals to the Analog Output Expansion Module see the Accessories section via a ribbon cable The output signals are used by the Analog Output Expansion Module to drive various con trol devices Communication Ports The MCB has two communication ports port A and port B Each port has six terminals and is set up for both the RS 232C and RS 485 data transmission interface standards The male and female connectors for these ports are manufactured by AMP Therefore they are referred to as AMP plugs or AMP connectors throughout this manual Socketed fuses located next to the ports protect the com munications drivers from voltage in excess of 12 Vdc Following are brief descriptions of each port s function Port A Port A is for communications with an IBM com patible PC using the RS 232C interface standard The PC can be directly connected over a limited distance with a twisted shielded pair cable or it can be remotely con nected via phone lines with a modem Port A can also be used to connect a licensed building automation system to the Microtech network via Open Protocol The default communications rate is 96
35. d chiller sequencing control decoupled chiller sequencing control or common leaving chilled water control is required See Figure 1 Typicai Chilled Water System for the location of the chiled water supply temperature sensor When using standard chiller sequencing control the common chilled water supply temperature sensor is used by the CSC to determine when a system capacity increase DY one eee is needed The increase is determined when common chilled water supply temperature by more than an adjustable differential When using decoupled chiller sequencing control the common chilled water supply temperature sensor is used by the CSC to determine when a system capacity increase MF F ee kw NA er Eee a tia gt J eres w w w by one stage is needed The increase is determined when the decoupler line temperature is greater than the common chilled water supply temperature by more than an adjust able differential When usina common leavina chiller water temperature eee iw A Y TEAL we 5 SSS EE wf control the common chilled water supply temperature sen sor is used by the CSC to set the Chiller Setpoint Chilled Water Return Temperature Sensor The common chilled water return temperature sensor is used when return chilled water temperature reset or con stant return chilled water temperature reset is required See Figure 1 Typical Simple Chilled Water System for the location of the chilled water return temperature sensor
36. d standby secondary pumps enables the CSC or the user to select what pump is the lead pump and what pump is the standby pump If the lead pump fails the standby pump starts automatically The auto lead feature automatically swaps the lead and standby pumps based on run time Figure 3d Sequenced Secondary Pumps Differential pressure transducer Unidirectional flow meter supply to return B Using sequenced secondary pumps enables the CSC to turn the chilled water pumps on and off to maintain a con stant pressure difference between the secondary supply and return lines Note If a pressure controlled loop bypass Figure 4 is used in conjunction with sequenced secondary pumps only one differential pressure transducer is required Loop Bypass Configuration The CSC will modulate the bypass valve as required to maintain an adjustable differential pressure setpoint The bypass line and differential pressure sensor shall be in stalled between the chilled water supply and return lines Figure 4 Pressure Controlled Loop Bypass Differential pressure transducer eo cae MM Fala a en hh ne enn IM 618 Page 7 General Description The MicroTech Chiller System Controller CSC is a micro processor based controller that provides sophisticated monitoring and control capabilities to McQuay chillers The CSC is designed to monitor and control up to four dual compressor centrifugal chillers up to eight single compres s
37. e a _ Te 9744 23 IM 618 Page 29 Test Procedures A listing of MicroTech related part numbers is included in the Parts List section of this manual If the MCB must be replaced refer to the MCB Replacement section of this manual Status LED Diagnostics The MCB status LED indications can aid in controller diag nostics If the status LEDs do not operate normally as de scribed in the Component Data section of this manual see Table 1 there is a problem with the MCB Following are troubleshooting procedures for the various symptoms Figure 24 CSC Schematic cont d ANALOG INPUTS 2 CLT Sk INPUTS ICM SEF NOTE 1 TERMINAL PEWER BOARD TR FIELD CCONTINLE D 100 At o suely cuter Y a i n7 j e a c EXTERNAL STARTZSTEP a 102 186 q 1 RETURN CH WIR TMP CARIA 03 FS oug g4 e e RESET EVERRIJE 104 0 120 e o a Leaving enome GI Lows o gj oaa ot ews 2 COGLING TOWER ALARM Xrea ice le2 7 Oyo 4 3 ENTERING COND THP meine oie ee ery Ne ee SECONDARY PUMP 1 108 M 184 e a a uisi aint G I w ies ol ee a SECONDARY PUMP W i 9 126 l f 4 s ecne me EY CMa i i 7 fof mee 5 SECONTARY PUMP 33 H 1 2 128 DECOUPLER FLOW CELIS nz il g 6 SECONDARY PLMP 4 114 130 g 7 LOOP CH WTR PRESS LI as tan ef ea 7 SECONDARY PL
38. e x The program code is also encoded in the controllers memory and is available for display on menu 28 of the keypad display or a PC equipped with Microtech Monitor software Using menu 28 or Monitor software is the most reliable way of determining the controller s program code CSC program codification is as follows CSC1E01A Chiller System Gomile H Program number 1 Standard software Units E English s Sl Version numeric Version revision alphabetical At the time of this writing the program codes for stan dard CSC software are CSC1 E01A and CSC1 01 A lf your CSC software has a later revision code for example CSC1 E01 B some of the information in this manual may be inaccurate However since only very minor software changes are considered revisions any inaccuracies should be insignificant Table 8 Progra i m Code CSC1 01A Software Compatibility OFTETE FERESE M Figure 10 Software ID Tag McQuay N 360 6548738 50 0 CSC1E01 A MCB part number SOFTWARE LD Program code Ident EOS NO 20 21 VENDOR S N 5354 VENDOR MDL 280 50 DATE CODE 06 95 Soft ware Compatibility Note that CSC1E01A and CSC1S01A are not compatible with some earlier versions of MicroTech centrifugal recip rocating and screw chiller controller standard software The current software compatibility is summarized in Table x The wildcard character can be any letter If you want
39. em or an Analog Output Expansion Module See the Accessories section of this manual for more information on the modem and Analog Output Expansion Module Power In Connector The MCB receives 18 Vac center tapped power from transformer T2 through the Power In connector This power drives all logic and communications circuitry the Atux Out terminal strip and the Keypad Display Board Refer to the panel s wiring diagram or Figure 24 for more information Power Fuses Two identical 2 amp fuses are located to the right of the Power In connector These fuses are in the MCB power supply circuit Microprocessor Status LEDs The green red and amber LEDs on the MCB provide in formation about the operating status of the microprocessor The amber LED also indicates the existence of alarm conditions Following is the normal start up sequence that the three status LED s should follow when power is applied to the MCB 1 The red Reset LED turns on and remains on for approximately 5 seconds During this period the MCB performs a self test 2 The red LED turns off and the green Running LED turns on This indicates that the microprocessor has passed the self test and is functioning properly 3 The amber Active LED remains off continually if no alarm conditions exist in the network If alarm condi tions exist the amber LED will flash as shown in Table 5 If the above sequence does not occur after power i
40. er should have as low an address as possible This will improve the performance of network communications because it will reduce the required value of the CSC s Total Slaves parameter and thus the amount of polling For example if a modem is connected to Chiller 3 you should consider setting Chiller 3 s hex switches to 01 See the CSC and Chiller Controller Initial Setup section in Bulletin No OM 127 for more information Networks With an NMP If a CSC is included in a network that has an NMP the NMP must be the level l controller In this case a CSC is a level 2 controller and the unit controllers are also level 2 control lers Since the NMP is level 1 its hex switch setting must be 00 The hex switch settings of the level 2 controllers must start at 01 and continue consecutively to a maximum of 40 decimal 64 There must be no gaps in the sequence and no duplicate settings As long as these rules are followed a level 2 controllers hex switches can be set to any value Two or more CSCs and multiple units are possible in this type of network For example assume that a MicroTech network includes an NMP a CSC two centrifugal chillers one screw chiller and one rooftop unit One possible addressing scheme is as follows Hex Switch Settlna Controller 00 NMP 01 CSC 02 Chiller 1 centrifugal 03 Chiller 2 centrifugal 04 Chiller 3 Screw 05 Rooftop air handling unit Networks With Two or More CSCs and
41. h AOX4 board as applicable Each time a component is re connected measure the resistance between field ter minals DC GRD and 13 Vdc It should steadily rise to a value greater than 5000 ohms If the resistance rises above 5000 ohms repeat this step until the modem and all AOX4 boards as appli cable have been checked out If the problem persists it is indeterminate Obtain factory service If the resistance does not rise above 5000 ohms the modem or the AOX4 board just connected is de fective With the power plug disconnected the resis tance across an AOX 4 boards DC and QG terminals should not be less than 3 million ohms Figure 25 MCB Power Supply Terminals POWER FUSES BUSSMAN GDC MA Q c AT mias Z Fuse F1 ZN _ Go Fuse F2 TO lt E al J ji 6 5i4 7 3 AUX OUT Troubleshooting Communications Problems If a communications problem occurs check the following items e Check the port B voltages e Check the port B fuses e Check the network integrity e Check the network addressing The best way to accomplish these checks is to perform the start up procedures in the Network Commissioning section of this manual If these procedures have performed and the problem persists obtain factory service Troubleshooting the Keypad Display Interface The Keypad Display Interface is connected to the MCB via a ribbon cable and discrete w
42. h Chiller System Controller ey eS re ee we KE TEE WF Figure 9 Keypad Display Interface LED Status Board Alarm I J B o o h Alarm LED The red Alarm LED will blink whenever there is an alarm in the CSC or any of the chillers Alarm Horn If i anakla tha minsa ala m annunci Tk IL is enabled UIG PIVeY aia i will sound whenever an ee occurs in the CSC or any of the chillers To silence the alarm Horn press the alarm key on the CSC s keypad You can also set up the horn so that it sounds only when certain types of alarms occur Comm i h Deak m Loss Faults Problems or Warnings For more information refer to the Alarm Monitoring section of Bulletin No OM 127 MicroTech Chiller System Controller Note Silencing the Alarm Horn does not clear an alarm For more information refer to the Alarm Monitoring sec tion of Bulletin No OM 127 1 System Status State On Schedule Chiller Stage 3 Chillers On 1 2 o 4 Status Alarm Control Switch 12 23 Jun 03 95 System Spt 44 0 F Average Load 76 E IM 618 Page 11 Software ID MicroTech CSC software is factory installed and tested in each panel prior to shipment The software is identified by a program code also referred to as the ldent which is printed on a small label affixed to the MCB An example of this label is shown in Figur
43. here is no voltage between any conductor and ground Use a voltmeter to test for voltage at the field wiring terminal block or directly on the port B connector of the level controller With one lead on the control panel chassis ground check for voltage at the and ground terminals There should be no AC or DC volt age see the Signal and Terminal columns of Table 13 If the conductors are properly terminated this check will test for stray voltage throughout the trunk Note If you get a 2 or 3 Vdc reading it indicates that one or more powered controllers are connected to the trunk These controllers should be located and disconnected 2 Verify that there are no shorts between any two conductors Use an ohmmeter to test for shorts at field wiring terminal block or directly on the port B connector of the level controller For the three combinations of con ductor pairs there should be infinite resistance be tween the conductors If the conductors are properly terminated this check will test for shorts throughout the trunk Note If you find a resistance that is high but less than infinite it indicates that one or more non powered controllers are connected to the trunk These control lers should be located and disconnected 3 Verify that the communications wiring is continuous over the trunk and that the field terminations are cor rect This step is optional but recommended to do it you must know
44. hown on the ICM Terminal Board regulated 5 Vdc 200 mA max load and 24 Vac 10 VA max load 3 An RS 485 pigtail connector p n 0063430601 is required to connect a series 100 centrifugal chiller into the network 4 lf the cooling tower alarm input is not used a jumper must be connected across terminals 120 and 121 PC Connection Regardless of whether a PC is connected directly or re motely via phone lines the connection to any MicroTech controller is at port A on the MCB It is best to connect a PC to a level l controller because faster data transmission will result however a PC can be connected to any level 2 con troller that does not have level 3 controllers associated with it Either way the PC will have access to the entire network see note below In the typical application the CSC is a level 1 and the chillers are level 2 See Network Commu nications above for more on network architecture It is possible to connect two or more PCs to the network but only one PC can be connected to any one controller The PC that is used most often should be connected to the level controller for better performance For example you may have one PC at the building that you use during the week and another PC at home that you occasionally use on weekends In this situation you may want to connect the on site PC to the level l controller and the modem for the off site PC to a level 2 controller Note If a PC is connected to a le
45. ia telephone lines with an optional modem Component Data Figure 5 shows the control panel layout for the CSC The main components of the controller are the Microprocessor Control Board MCB the Output Board OB the Input Conditioning Module ICM Terminal Board and the Key pad Display Interface KDI All of these major components are mounted inside a standard NEMA 1 enclosure They Figure 5 CSC Layout ICM Terminal Board 1e o S19 1416 S14161 6 9 1919 are interconnected by ribbon cables shielded multi conduc tor cables or discrete wiring Power for the system is pro vided by transformers T1 and T2 Following are descriptions of these MicroTech compo nents and their input and output devices OB o Page 8 IM 618 l Wo ay aV iav IN y IV OC oC DC GAD GRD GAD ac I i 000 2 2 2 ER Microprocessor Control Board The Microprocessor Control Board MCB is shown in Fig ure 6 It contains a microprocessor that is preprogrammed with the software required to monitor and control chillers that are connected to the CSC The various MCB connec tions and components are described below Figure 6 Microprocessor Control Board MCB HI LO Y EXPANSION BUS ADDRESS FUSE 1 2 Hex switches v A KEYPAD LCO DISPLAY PORTA PORTB COMMUNICATIONS FUSE BUSSMAN MCR 1 4 e 2 a
46. ices with the wiring disconnected The resistance across the power input terminals on the keypad display G and 5V should be close to infinite The resistance across the power input terminals on the Output Board and should not be less than 3000 ohms When the field wiring and the OB are discon nected the resistance across the power input terminals on the ICM Terminal Board H7 1 and H7 2 should be infinite If the component resistances are proper check the resistance of the field supplied loads if any and check the wiring and connections throughout the 5 Vdc power supply circuit Disconnect the connector plugs from the modem and the power plug from all AOX 4 boards as applicable With circuit breaker CB1 open measure the resistance between field terminals DC GRD and 13 Vdc It should be infinite If the resistance is infinite go to step 12 If the resistance is not infinite a short exists some where in the 13 Vdc power supply wiring Reconnect the Aux Out connector plug to the MCB If there s a modem reconnect its AMP plug to port A With circuit breaker CB1 open measure the resistance between field terminals DC GRD and 13 Vdc It should steadily rise to a value greater than 5000 ohms within approximately 30 seconds If the resistance rises above 5000 ohms go to step 13 If the resistance does not rise above 5000 ohms the MCB is defective 13 One at a time reconnect the modem and eac
47. iew 1 7 8 48 7 8 22 3 Dia knockouts 6 3 8 162 10 7 8 gt 276 2 391 22 1 8 562 Bottom View Numbers in parenthesis millimeters mm IM 618 Page 15 Sensor Installation Figures 14 and 15 show the dimensions of the water tem perature sensors and thermowell used with the CSC All temperature sensors are negative temperature coef ficient thermistors Figure 14 Immersion Sensor Greenfield Connector Poo 1 8 NPS Zip Cord 96 0 16 2438 406 4 87 15 124 3 8 25 03 DIA 6 4 76 Page 16 IM618 The brass well screws into Ya inch NPT saddle or Thre dolet fitting furnished by the installing contractor The brass well will withstand a maximum temperature of 250 F and a maximum static pressure of 250 psig Figure 15 Brass Thermowell 1 8 27 NPS Internal Thread 75 25 deep 19 6 4 1 2 NPT 5 12 15 130 3 8 3 25 15 82 6 3 8 le 37 03 DIA 9 4 76 Field Wiring Following are descriptions of the various field wiring re quirements and options A typical field wiring diagram is shown in Figure 16 Wiring must comply with the National Electrical Code and all local codes and ordinances The warranty is void if wiring is not in accordance with these instructions The panel is separated into high and low voltage sec tions The power wiring
48. igure 18 RS 232 Cable Pinouts for 25 Pin Serial Ports AMP Connector Female DB 25 Signal AMP Plug Signal Pin IM 618 Page 19 E a o o o 2 e a Sic T S S 8 E 2 siol S CSC Feature ajej E E el S zj 3 S S 5 2iele es e hm Q elel lt i o a ef e elei 3 3 s 2 eEleElZIsi 8 818ls 0 OI gi 3 oO ooj c o1 o l alu jo0 alalso Ext ChW Reset Signal _ q 3 2 35 C E a gt Q sl Otel sala boy vj E 8 silp me elels Slslelaele jelgidicis k a eo a oa a Q Elais EIS ZE E ELETE oie 515 Q l l l Sja j ja S Sia e el z elezrz z z ziz jg elz H 6 9G eo 8 amp a ol 5 oi OD R IOISISI S m 5 3 5 235 5 g 5 5 5 4 l 6 9 o o15 o0 0 ao Oo Riki j o a oj o amp i ao o o s6 6 ull olo oldloloal lal lal lol Standard chiler sequencing conl ff ft tt Pe PM RC Decoupied chilier sequencing control Enema Demencuming 1111111747 a Unit leaving chilled water control Common vg chilled water comol Ye ee nee i a oe eee ie E Heaps gh External reset hoy Quidoor air temperature reset en a E Fc Sa SA REE Ce as Ca Constant on ChW temp control e Ge et Gc a I A GO SAR SEE Secondary pump contro VED fF ff Pt pp yp tt tt te jv fot tvto tf Sec pump controi Sequenced Sec purperen OEE eo Cooling tower
49. ing Tower Alarm When a digital output through the Output Board Digital Output 9 is sent to the DPDT relay the cooling tower device will be enabled When the cooling tower device is enabled a normally closed contact TC1 will open Allow ing for a 30 second time delay a normally open contact TS1 will close thus completing the circuit If TS1 does not close within the 30 second time delay an alarm will occur These same events occur in each DPDT relay that is con nected to a cooling tower digital output Note f the cooling tower alarm is nof going to be used place a jumper across terminals 120 and 121 Digital Input 2 on the ICM Terminal Board Secondary Pump 1 6 Status Digital Input 3 8 The secondary pump 1 6 status inputs enable the CSC to monitor the status of the secondary pumps One input must be connected to each secondary pump used ae 24VAC or 115 VAC 24AG 24G 60C 50 T lSieile Communication Ports Terminals A A G B B G 4 4 LEGEND TC1 Control point for output 1 Normally Closed TSi Status point for output 1 device Normally Open Field Wiring Terminals Field Wiring Page 22 IM 618 T9 lelele 1644 o ipl 16S 9 DI 17 F Digital Output 9 Tower Output 1 ot o o o O o oe Oe 6 o a Figure 20 Analog Digital Input Field Wiring Connection Analog Input Device Chilled Water Supply Temperature Sensor
50. iring for the back light The MCB provides operating voltages control signal outputs for the display and input conditioning for the keypad inputs Display is Hard to Read The clarity of the LCD display can be affected by ambient temperature Typically less contrast will result with cooler temperatures If the display is difficult to read adjust the contrast trim pot which is located on the back of the key pad display assembly IM 618 Page 31 Back Light Not Lit The Keypad Display Interfaces supplied with the CSC is equipped with a back light If the light does not come on check for 5 Vdc at terminal 9 on the IDC connector on the KDI and for 5 Vdc on the CSC field wiring terminal strip Check for 5 Vdc on the IDC connector on the To check for the 5 Vdc on the IDC connector pull back the plug about one eighth of an inch and place the test leads against the exposed pins If there is no voltage check the wiring and the connections between the CSC s 5 Vdc field wiring ter minal strip and the KDI If the wiring is intact the MCB is probably defective Display is Blank or Garbled If the MCB appears to be functioning properly and the dis play is completely blank or garbled perform the following procedure 1 Try cycling power to the controller by opening and then closing circuit breaker CB1 see note below 2 Try adjusting the contrast trim pot which is located on the back of the keypad display assembly If the contrast tri
51. le The factory will download the proper controller software into a replacement MCB board before it is shipped if you include the CSC s program code with the replacement MCB part order If the program code is not provided the MCB board will be shipped without software Job specific Monitor software includes each unit and auxiliary controllers program Therefore it is possible to download the proper controller software to a replacement MCB at the building site if a PC equipped with that job s Monitor software is available In addition if the controller s configuration data was stored on the PC hard drive prior to the MCB failure the exact configuration data including all keypad programmable setpoints and parameters can be restored Refer to the users manual supplied with the Monitor software for more information Parts List 7 5 i MCB ICM Term Brd T1 T2 CB1 PC Communications Cable Kit RS 232 Cable Extension Kit C Input Conditioning Module AOX 4 Analog Output Expansion Module SR Solid State Relay Kit Solid State Relay AC Solid State Relay DC Dry Contact Rela Notes nput Conditioning Module Terminal Board a Fuse MCB Communication Ports 0 25 Amp pd 0 Ribbon Cable Assembly MCB to Output Board Ribbon Cable Assembly MCB to Keypad Display Interface Ribbon Cable Assembly MCB to ICM Terminal Board Analog Input Ribbon Cable Assembly MCB to ICM Terminal Board Digital In
52. led water loop bypass valve to maintain an adjustable differential pressure setpoint The CSC uses a secondary chilled water pump with variable frequency drive VFD to maintain a desired pres sure differential across the chilled water loop Secondary Pump VFD Pump 2 The CSC can operate two variable speed secondary pumps in either a lead standby or sequenced control configuration The output signal at A02 is always the same as AO1 IM 618 Page 23 Figure 21 Analog Outputs Field Wiring Connections To MicroTech 1 Analog Output Controller Ground Analog Output 2 Device a Device _2 Current Mode g Voltage Mode AOX 4 Board Expansion Bus 5V 13V 13V DC DC 24V 24V DC OC DC GND GND GND AC Ribbon Cable MCB Sra ny Page 24 IM 618 GPERPRERELERRRRE EJ G2 Digital Outputs The CSC provides digital output signals from the MCB s Digital Output connector to the Output Board OB via a ribbon cable When the MCB commands a certain output the designated relay on the OB energizes and drives an AC or DC load Note that power to loads must be field supplied and the proper relay AC DC or dry contact must be se lected For more information on the OB refer to Output Board in the Component Data section of this manual or see Bulletin No IM 606 MicroTech So id State Relay Kit Note All digital outputs have fixed locations see Figure 16 Alarm L
53. ler installation manuals for information on how to turn on power to each controller 3 Check the voltages of port B directly on the AMP con nector The trunk must not be connected to the control ler when you do this Use a DC voltmeter to test for proper voltages With the ground lead on the control panel chassis ground check the voltage at the and ground terminals Refer to Table 13 for the correct voltage levels If no voltage or improper voltage levels are found verify that the controller is energized IM 618 Page 27 4 Check for proper communication trunk voltages at the field wiring terminals if any or directly on the connec tor The trunk must not be connected to the controller when you do this If no voltage or improper voltages are found check the wiring between the port terminals and the field ter minals if any Using Table 13 and Figure 22 verify that the three conductors are properly terminated in the network communications connector If there is still a problem verify that the level l controller is energized and that the communications trunk wiring is intact 5 Plug the network connector into port B 6 Verify communications have begun between CSC and the level 2 controller To verify the level 2 controllers are communicating with the CSC use the CSC s keypad display or a PC equipped with Monitor for Windows software To verify communications using the CSC s ke
54. m pot has no effect it is likely that either the key pad display or its ribbon cable is defective 3 After removing power from the controller check the ribbon cable and connections between the key pad display and the MCB Look for bent pins Restore power after reconnecting the ribbon cable 4 Try swapping a known good ribbon cable and key pad display Swap these components separately to isolate the problem Remove power from the controller before disconnecting the suspect component and re store power after connecting the replacement compo nent If the problem persists it is likely that the MCB is defective Troubleshooting Analog Inputs An analog input such as a room temperature sensor is connected to the Analog Input terminal strip on the Input Conditioning Module Terminal Board The analog input is then conditioned by the Input Conditioning Module ICM The conditioned input is transferred to the MCB via a ribbon cable Analog Input not Read by the MCB If the MCB appears to be functioning properly and the analog input is not being read by the MCB perform the following procedure 1 Try cycling power to the controller by opening and then closing circuit breaker CB1 2 Check the ribbon cable power wiring connector H7 and the field wiring connections from the analog input device Look for bent pins cable on backwards or miswires Restore power after reconnecting all cables and wires 3 If the problem persi
55. n figurations can be all centrifugal all reciprocating all screw or a combination of centrifugal reciprocating or screw The CSC may be suitable for applications other than the ones shown If your application does not match one of the listed configurations contact your McQuay sales represen tative for assistance Typical Simple Chilled Water System The typical chilled water system configuration is shown in Figure 1 The characteristics of this system consist of the following 1 a set of chillers usually piped in parallel 2 each chiller has its own primary chilled water pump 3 the system may or may not have a bypass line and valve that is controlled by a differential pressure controller 4 the sys tem may or may not have secondary pump s to distribute water to the cooling loads To see the various configurations available Figures 2a 2f Figures 3a 3d and Figure 4 can be inserted into the typical simple chilled water system shown in Figure 1 Note As used throughout this manual the word chiller means chiller in all cases except for dual compressor cen trifugals For these machines each compressor along with its associated MicroTech controller is considered a chiller Figure 1 Typical Simple Chilled Water System Cooling Loads Loop bypass configuration see Figure 4 Chiller 1 centrifugal Chiller 2 centrifugal Chiller 3 centrifugal Chiller Evaporator Configuration In the
56. nector are field wiring terminals for 5 Vdc regulated and 24 Vac ground referenced These terminals can be used to power peripheral devices The 5 Vdc is also used to power the LEDs in the Output Board Communications Located on the ICM Terminal Board are communications field wiring terminals Terminals B B and GND connect to the chiller unit controller s communications field wiring terminals Terminals A A and GND connect to an op tional PC with MicroTech Monitor software Snap Track The snap track is a device used to mount circuit boards in particular the AOX 4 board to the CSC The snap track is located directly below the Input Conditioning Module ICM Terminal Board Ridges on the top and bottom of the snap track hold the circuit board in place Figure 8 Input Conditioning Module Terminal Board 24AC 24G 5DC 5G 4AC 24G 4G 50C 5G T7 elele T8 GOGU T9 lelle oo E 100e e 2 116 132 1 og or 148 164 o 180 K4 l Z V Kd 101 e 117 133 1 pa 149 165 N ame 181 102 TE 118 134 1 ng pig 150 166 py a7 Ph 182 103 119 135 151 167 183 104 1 5 2 120 Important e aro ee wi to e 168 184 O m Dmt nS a h e rag Ol 4c Al 18 DI 185 193 121 DISCONNECT an 153 169 bd 189 106 AI 3 DI aC 122 PETOR SERVICING 138 A414 er 154 170 i S 186 INPUT CONDITIONING FA FA JAI 19 EJ 107 j 12
57. oller there is likely a defective compo nent or a problem in the controllers power distribution cir cuits Refer to Troubleshooting Power Problems below Troubleshooting Power Problems The MCB receives 18 Vac center tapped power from transformer T2 It then distributes both 5 Vdc and 13 Vdc power to various MicroTech components A problem that exists in any of these components can affect the MCB and thus the entire control system Power problems can be caused by an external short which can blow a fuse or a defective component which can either blow a fuse or cre ate an excessive load on the power supply An excessive load can lower the power supply voltages to unacceptable levels Use the following procedure to isolate the problem Note that this procedure may require two or three spare MCB fuses see parts list Refer to the panel wiring dia gram or Figure 24 as you proceed 1 Verify that circuit breaker CB1 is closed 2 Remove the MCB Power In connector and check for 9 Vac between the terminals on the plug corresponding to terminals 2 and 3 on the board see Figures 2 and 15 Then check for 9 Vac between the terminals on the plug corresponding to terminals 1 and 3 on the board Readings of 9 12 Vac are acceptable if 9 Vac is present between both sets of terminals go to step 3 If 9 Vac is not present between both sets of termi nals check transformers T2 and T1 and all wiring be tween the 115 Vac source and the P
58. or centrifugal chillers up to eight non cenitrifugal chillers reciprocating and screw or any combination that results in eight or fewer unit controllers The CSC s design offers full input and output flexibility The base panel is equipped with an Input Conditioning Module ICM that can condition eight analog and eight digital inputs and keypad display that provides a user inter face to the control panel for the monitoring and control of attached chillers The CSC also has accessories that can increase the number of inputs and outputs Up to two more ICMs can be purchased increasing the number of analog and digital inputs to 24 Up to three Analog Output Expansion Modules AOX 4 can be purchased providing twelve analog out puts A relay kit is an option that can add eight digital out puts Each relay kit is equipped with eight AC power rated relays The relays are plugged into the Output Board OB Up to three relay kits can be ordered for a total of 24 digital outputs The CSC is capable of performing all network communi cations required for complete chiller system control If de sired it can be incorporated into a MicroTech network that includes a Network Master Panel NMP and other Micro Tech controllers In either case an IBM compatible com puter containing Microlech Monitor software can be connected to give you full screen monitoring and control capability The computer can be connected directly or re motely v
59. ossible to determine whether a solid state relay is defective by using these procedures However if you need more information on troubleshooting them refer to Troubleshooting Solid State relays below Figure 26 Output Board Relay Socket HO re Z a 250V 50160 Hz 120V 50 60 Hz Test Resistor x 330 680 Ohm Gc A WARNING Electric shock hazard Can cause severe injury or death Even when power to the panel is off solid state relay socket terminals 1 and 2 on the output board could be connected to high voltage see Figure 26 Avoid them One LED Out If one of the Output Board LEDs fails to illuminate when the MCB is commanding the associated output to energize perform the following procedure 1 Remove power from the controller by opening CB1 Swap the suspect relay with a known good relay Try to choose a relay that will not affect unit operation Re store power by closing CB1 If the LED does not light go to step 2 If the LED lights the suspect relay is defective 2 Remove power from the controller Check the ribbon cable and connections between the OB and the MCB Look for bent pins If the cable and connections are intact go to step 3 3 Remove the relay from the suspect socket Install a 330 680 ohm resistor between terminals 3 and 5 as shown in Figure 26 Restore power by placing CB1 to the ON position The LED should light regardless of the controller s command If
60. ower In plug 3 Remove power from the controller by opening circuit breaker CB1 Check the MCB power supply input fuses F1 and F2 with an ohmmeter See Figure 25 A good fuse will have negligible resistance through it less than 2 ohms If either or both fuses are blown replace them Go to step 4 If the fuses are intact the MCB is defective 4 Reconnect the Power In connector and disconnect all other connectors on the MCB Cycle power to the con troller close and then open CB1 and check the power fuses If both fuses are intact go to step 5 If either fuse blows the MCB is defective 5 Reconnect the keypad display ribbon cable if equip ped with keypad display door Cycle power to the con troller and check the power fuses If both fuses are intact go to step 6 If either fuse blows check the keypad display and the connecting ribbon cable for shorts Either one may be defective 6 Reconnect the analog input ribbon cable Cycle power to the controller and check the power fuses If both fuses are intact go to step 7 12 If either fuse blows check the ICM Terminal Board the ICMs if any the connecting ribbon cable and the field wiring for shorts Any of these may be defective Try repeating this step after removing or swapping ICMs Reconnect the digital input ribbon cable Cycle power to the controller and check the power fuses If both fuses are intact go to step 8 If either fuse blows check the
61. put 733758B 01 Ribbon Cable Assembly 9 MCB to AOX 4 Ribbon Cable Assembly 3 AOX 4 to AOX 4 654873B 50 733849C 01 492655B 04 733785B 01 606308B 01 467381B 14 473573B 08 658220A 01 658219A 01 0057186802 0065487001 492652B 07 733665B 01 733758B 02 654997B 02 654997B 06 0072140601 0055323601 0055323701 0055323901 0049265601 0049265602 0049265603 1 If desired the factory can download the correct software into the replacement MCB prior to shipment See the MCB Replacement section above for more information IM 618 Page 35
62. quencing control is required See Figures 3a through 3d for the locations of the decoupler line tempera ture sensor The decoupled chiller sequencing control will increase the system capacity by one stage when the decoupler line temperature is greater than the common chilled water sup ply temperature by more than an adjustable differential Decoupler Flow Rate Sensor The decoupler flow rate sensor is used by the CSC to de termine when the system capacity should be decreased by one stage See Figures 3a through 3d for the location of the decoupler flow rate sensor When the flow rate from supply to return in the decoupler line is greater than the flow rate of the next chiller s to be staged off by more than the adjustable differential the system capacity may be reduced by one stage Note that since flow is only measured from supply to return a uni directional flow meter is sufficient Chilled Water Loop Differential Press Transducer The chilled water loop differential pressure transducer is used when chilled water loop bypass valve control secon dary pump control or secondary pump conirol variable speed is required See Figure 3b Variable Spoeed Secon dary Pump Figure 3d Sequenced Secondary Pumps and Figure 4 Pressure Controlled Loop Bypass for the locations of the chilled water loop differential pressure transducer When chilled water loop bypass valve control is used the chilled water loop differential press
63. rcuit shown in Figure 28 is similar to a typical circuit the difference is that there is an open set of con tacts or a disconnection between the relay output and the load In this circuit a solid state relay will not behave like an electromechanical relay if the solid state relay is energized the relay output will be hot as expected However if the solid state relay is de energized the relay output will still appear to be hot This is because the relay output and the voltmeter form a continuous circuit in which the relay s resistance though high is insignificant compared to the voltmeter s resistance This means that nearly all the voltage is dropped across the voltmeter Therefore the voltmeter indicates that voltage is present If a low wattage light bulb of the appropriate volt age is used instead of a voltmeter the bulb s low resistance will load the circuit enough to eliminate the false voltage indication In this situation an incandescent test lamp is a better tool than a voltmeter Figure 27 Testing a Typical Relay Circuit 115VAC Output Board Neutral Figure 28 Testing a Relay Circuit with a Disconnection _ 115VAC Outout Board ss mr a MCB Replacement If an MCB board is defective and must be replaced the proper controller software must be loaded into the replace ment MCB This can be done either at the factory or at the building site if a PC equipped with appropriate Monitor software is availab
64. s ICM Each ICM can condition up to eight analog and eight digital input signals These input signals come from external devices such as room temperature sensors or dry contacts The signals enter the ICM through the field wiring terminals labeled Al and DI on the ICM terminal board Analog Input Al There are three analog input field wiring terminal strips labeled Tl T3 and T5 Each terminal strip has 16 screw terminals When an analog signal is connected to the ter minal strip the positive wire connects to the even num bered screw terminal and the ground wire connects to the odd numbered screw terminal see Table 6 input Field Wiring Terminal Strip Numbers Be wal Strip Number __ Screw Terminai Rango 132 147 164 179 Digital input Dl There are three digital input field wiring terminal strips labeled T2 T4 T6 Each terminal strip has 16 screw termi nals When a digital signal is connected to the terminal strip the odd numbered screw terminal sends 24 Vac to the external device When a contact in the external device closes the 24 Vac passes through the contact and back through a return wire to the even numbered screw terminal This return voltage then trips an opto electric switch allow ing the MCB to sense the digital input Table 7 Digital Input Field Wiring Terminal Strip Numbers Terminal Strip Number Screw Terminal Range T2 1164151 T4 148 163 T6 180 195 Power Above each edge card con
65. s applied to the controller there is a problem with the MCB or its power supply For more information refer to the Test Procedures section of this manual which is under Service Information Tables 4 and 5 summarize the green red and amber status LED indications Table 4 Green and Red Status LED Indication LED State eee tio L No power to MCB Off On Self test ttilureo MCB operating normall For longer than 5 seconds Table 5 Amber Status LED Indication Indication Normal operation On 1 2 second Off 1 2 second Alarm condition Keypad LCD Display Connection The MCB receives input commands and operating parame ters from the keypad and sends requested information to the display through the Keypad LCD Display port via a plug in ribbon cable Hex Switches The MCB includes two hex hexadecimal switches that are used to set the CSC network address The HI and LO hex switches are shown in Figure 7 A hex switch setting is defined as the HI switch digit followed by the LO switch digit For example a hex switch setting of 2F would have the HI switch set to 2 and the LO switch set to F Refer to Addressing the Controllers in the Network Commissioning section of this manual for more information IM 618 Page 9 Note You can change the setting of a hex switch with a s2 inch tip slotted blade screwdriver If a hex switch setting is changed power to the MCB must be cy
66. se systems Figures 2a through 2d the temperature of the water entering the loads will always be very close to each chillers leaving evaporator water temperature setpoint Figure 2a Parallel Configurations Chiller 1 reciprocating Chiller 2 centrifugal Chiller 3 centrifugal Chiller 8 wee ee ee ee ee Hee ee ee ee ee ew we www we wee ww we eee ee Ke Ke ee ee ee ee ee ee ee ee ee ee es Figure 2b Series Parallel Configurations Chiller 1 Chiller 2 reciprocating reciprocating Chiller 3 Chiller 4 centrifugal centrifugal Chiller 5 Chiller 6 centrifugal centrifugal Chiller 7 Chiller 8 Chiller 1 amp 2 dual centrifugal Chiller 3 amp 4 dual centrifugal Chiller 5 amp 6 dual centrifugal Chiller 7 amp 8 dual centrifugal IM 618 Page 5 Figure 2d Combination Configurations Chiller 1 reciprocating Chiller 2 Chiller 3 Chiller 4 centrifugal centrifuga Chiller 5 amp 6 dual centrifugal Chiller 7 amp 8 dual centrifugal Figures 2e and 2f are the same as the above configura tions except 1 all chillers share a common primary pump Figure 2e or 2 all chillers share a common primary pump but each chiller has an isolation valve Figure 2f Figure 2e Above Configurations with Common Primary Pump In the configuration of Figure 2e the chilled water supply temperature will be very close to each chillers leaving evaporator
67. should enter the bottom knockout on the right side of the panel in the high voltage section Wiring from the Output Board should enter through one of the 7 s inch knockouts in the high voltage section Commu nications wiring wiring to the ICM Terminal Board and wiring to the AOX 4 should enter through the top of the panel in the low voltage section through one of the inch knockouts provided Note High voltage wires should not pass through the low voltage section and the low voltage wires should not pass through the high voltage section Power A WARNING Electric shock hazard Can cause personal injury or death This equipment must be properly grounded All protective deadfront panels must be reinstalled and secured when power wiring is complete The CSC requires a 115 Vac power supply The supply connects to terminals L1 and L2 in the high voltage section of the panel The panel must be properly grounded by con necting the ground lug GRD to earth ground Refer to Figure 16 Power wiring must be sized to carry at least 5 amps To gain access to the high voltage section remove the deadfront barrier It is attached to the panel with five 5 6 inch hex screws Replace this deadfront when the wiring is complete Network Communications For network communications to occur a twisted shielded pair cable must be connected between the CSC and its associated MicroTech unit or network controllers This inter connecting d
68. ss Machines Corporation 1995 McQuay international All rights reserved throughout the world Illustrations Figures 1 Typical Simple Chilled Water System 0000 cee 5 2a Parallel Configurations 0 ccccceccecceseseseseseeeresenes 5 2b Series Parallel Configurations cccccecessesernees 5 2c Dual Compressor Centrifugal Configurations 5 2d Combination Configurations 00 0 0cecceceeesereeeen 6 2e Above Configurations with Common Primary Pump 6 2f Above Configurations with Common Primary Pump AN Isolation ValVeS cccccsccccccccecceesesseesseseneeeeees 6 3a Fixed Speed Secondary Pump 00 c cesses 6 3b Variable Speed Secondary Pump cc ccceseseeee 6 3c Lead Standby Secondary PUMPS T 3d Sequenced Secondary Pumps cccccecceseeseeeee 7 4 Pressure Controlled Loop Bypass 0 0cccce ee 7 Bt CSG EOU aaora a ease eriveicin onan Aa T 8 6 Microprocessor Control Board MCB aaaeeeaa 9 Ka TIEZ OWIES oaran a a E esiesehastarede 10 8 Input Conditioning Module Terminal Board 11 9 Keypad Display Interface 0 a 11 10 Software ID Label ccescscssesesssecessesesteceeeees 12 11 input Conditioning Module ICM ee 13 12 Analog Output Expansion Module AOX 4 13 13 CSC DIMENSIONS ssiieisaiccienceevieial sdenisechvoce Sovoteeesteasads 15 14 Immersion Sensor esiseina 16 15 Brass Thermowelll
69. start depending on what number stage is chosen The CSC will control the tower stages by using the cooling tower staging control feature Network Commissioning The purpose of network commissioning is to establish and verify communications between the CSC and its associated centrifugal reciprocating or screw chillers It is not to establish and verify HVAC equipment operation Network commissioning can be done independently of the unit commissioning procedures however if it is done before the units are commissioned care should be taken to assure that the chillers do not start To do this see the CSC and Chiller Controller Initial Setup section of Bulletin No OM 127 MicroTech Chiller System Controller To commission the network you must be familiar with the operation of the keypad display For information see the Getting Started portion of Bulletin No OM 127 Before any unit is allowed to operate it must be com missioned in accordance with the instructions in the Micro Tech unit controller installation literature and the model specific unit installation literature see Tables 1 and 3 In addition the CSC and its associated unit controllers must be set up so that they work properly together This setup which can be done before or after the network is commis sioned is described in Bulletin No OM 127 A PC is not required to commission networks that in clude only CSC s and associated chillers because com munic
70. stop go to step 3 If the chatter stops the suspect relay is defective Replace the relay 3 Remove power from the controller by opening CB1 Try to improve the connections in the Aux Out plug insula tion displacement terminals by pressing down on the wires with a small screwdriver 4 Check all other wiring and connectors for bent pins or miswires If the chatter does not stop the electromechanical relay or contactor is probably defective Troubleshooting Solid State Relays As shown on the unit wiring diagrams the solid state relays on the Output Boards all have normally open contacts Actually these contacts do not exist as they do in an elec tromechanical relay Instead of using contacts to switch the load the solid state relay changes its resistance from low closed when it is energized to high open when it is de energized This high resistance is approximately 100K ohms Because the output circuit through the solid state relay remains continuous regardless of whether the relay is energized troubleshooting a solid state relay with a voltme ter can be tricky Page 34 1IM 618 In a typical circuit a power source is connected across a single relay output and a load see Figure 27 In this cir cuit a solid state relay will behave like an electromechani cal relay If the relay is energized the relay output will be hot If the relay is de energized voltage cannot be meas ured at the relay output The ci
71. sts try swapping a known good ribbon cable an Input Conditioning Module ICM or analog input device Swap these components sepa rately to isolate the problem Remove power from the controller before disconnecting the suspect compo nent and restore power after connecting the replace ment component f the problem persists it is likely that the MCB is defective Page 32 IM 618 Troubleshooting Digital Inputs A digital input device is connected to the Digital Input ter minal strip on the Input Conditioning Module Terminal Board 24 Vac supplied by the CSC is sent to the digital input device via a supply wire When a contact in the digital device makes a return signal is sent back to the Digital Input terminal strip The signal is then conditioned by the Input Conditioning Module ICM The conditioned digital input is then sent to the MCB via a ribbon cable Digital Input not Read by the MCB lf the MCB appears to be functioning properly and the digi tal input is not being read by the MCB perform the following procedure 1 Try cycling power to the controller by opening and then closing circuit breaker CB1 2 Check the ribbon cable power wiring connector H7 and the field wiring connections from the digital input device Look for bent pins cable on backwards or miswires Restore power after reconnecting all cables and wires 3 If the problem persists try swapping a known good ribbon cable an Input Conditioning
72. sy chain manner as shown in Figure 16 Use caution to ensure that the cor rect polarity is maintained at each controller Be sure to connect each cable s shield to the controllers as shown in the figure The positive negative and shield ground conductor must be continuous over the trunk IM 618 Page 17 Figure 16 CSC Field Wiring Schematic ICM Terminal w External ChW reset signal g O Demand limiting signal Q O g O FOTE ee TFaLTENT IT ol pP aT ede es aaa q Fz ChW supply temperature ae AlO DOO m E J E F TES ChW return temperature G EF Alt DO 1 ao Gal t i 3 EH Leaving CndW temperature ee Al2 002 F AEE mi ad L e Entering CndW temperature ae Al 3 DO 3 za a i i SE Nea oie T Fy n Outdoor air temperature ES Al 4 DO 4 EN E m 7 z mH Decoupler line temperature ie Al5 DO 5 eee mat lL brea omen E 13 Decoupler line flow rate EF AIG DO 6 mak Fes L QS ee gt 3 H Loop differential pressure DPT Al7 DO 7 E Ee ees pried aad L AR bet B a catuceenanel External start stop DIO Do9 gt or oi 7 L ewes ooo Chilled water reset override DI 1 DO 10 Cooling tower alarm see note 4 Di2 on ea ooling tower alarm see note X DO 11 EE re m A m 25 oe Secondary Pump 1 status
73. t IM 618 Page 13 Microtech Monitoring and Networking Options PC Monitoring A PC personal computer equipped with the appropriate Monitor software can be used to provide a high level inter face with a MicroTech network see PC specification below Monitor software features a Windows based display multilevel password access and advanced trend logging The PC can be connected to the CSC controller either directly via a single twisted shielded pair cable or remotely via phone lines with an optional modem For more information on connecting the PC to the controller refer to PC Connection in the Field Wiring section of this manual For the most convenience and best operation the PC should be considered dedicated to the Microlech system However you can exit the Monitor program to perform other tasks without affecting equipment control Refer to the users manual supplied with the Monitor software for addi tional information PC Specification A direct or remote connected computer can be used for monitoring CSC and unit operation changing setpoints scheduling trend logging downloading software and diag nostics The PC must be an IBM or 100 true compatible Table 10 shows the preferred and minimum PC specifications Table 10 PC Specification 486DX processor 66MHz or better 8 MB of RAM or better 120 MB hard disk drive or better 3 floppy disk drive Serial port 9 pin male Parallel port
74. te PC to communicate with the networked controllers via phone lines A modem kit that can be field installed in a MicroTech controller is available from McQuay International The kit comes complete with a 14 400 baud modem set up for 9600 baud and an interface cable If a remote PC connec tion is required it is recommended that the modem at the MicroTech controller be supplied by McQuay International Installation and wiring instructions for the modem kit are included in Bulletin No IM 564 MicroTech Modem kit This bulletin is included with the kit Cable Specification for Direct PC Connection A properly terminated twisted shielded pair cable is re quired to directly connect a PC to a MicroTech controller The cable must meet the following minimum requirements twisted shielded pair with drain wire 300 V 60 C 20 AWG polyethylene insulated with a PVC outer jacket Belden 8762 or equivalent It must also be properly terminated to an AMP plug on one end and a female DB9 or DB25 con nector on the other See Figures 15 and 16 for cable pinouts The DB9 or DB25 connector is for connection to a 9 pin or 25 pin serial port on the PC Note that some local codes or applications may require the use of plenum rated cable Do nof install the cable in the same conduit with power wiring Note A factory assembled cable that meets the above specification is provided with the PC Communications Cable Kit This cable has a DB9 connector F
75. terminals with a small screwdriver LED Lit Output not Energized lf the LED of a suspect output is lit but the load connected to it is not energized and everything is intact between the MCB and the coil side of the relay perform the following procedure to isolate the problem 1 Verify that 24 or 120 Vac power is present at the sus pect output s screw terminal on the Output Board 2 Remove power from the controller by opening CB1 Pull the 5 amp fuse on the contact side of the relay and check it for continuity with an ohmmeter If the fuse is not bad reinstall it and go to step 3 If the fuse is bad replace it and inspect the load and associated wiring before restoring power Note that a fuse from an unused output can be substituted for the bad fuse 3 Remove power from the controller by opening CB1 Swap the suspect relay with a known good relay Try to choose a relay that will not affect unit operation Re store power by closing CB1 If the output load energizes the suspect relay is bad Replace the relay If the output load does not energize when LED is lit again check the load circuit wiring and components IM 618 Page 33 Output Energized LED not Lit If the LED of a suspect output is not lit but the load con nected to it is energized either the solid state relay or the MOV is bad The solid state relay contacts and the MOV which are in parallel can both fail closed Perform the fol lowing procedure to
76. the output LED illuminates it is likely that the MCB is defective If the output LED does not illuminate the output board is defective All LEDs Out If the MCB is commanding at least two outputs to energize and none of the Output Board LEDs are lit perform the following procedure 1 Verify that 5 Vdc is present at the Output Board s power terminals If 5 Vdc is not present go to step 2 If 5 Vdc is present check the ribbon cable and con nections between the output board and MCB Look for bent pins If the cable and connections are intact the Output Board or the MCB is defective 2 Remove power from the controller by placing CB1 to the OFF position Disconnect at least one wire from the power input terminals of the Output Board The resis tance should not be less than 3000 ohms If the resistance is greater than the acceptable value go to step 3 If the resistance is less than the acceptable value the Output Board is defective 3 Check the discrete wiring and connections between the following Input Conditioning Module Terminal Board T10 and OB input power field wiring terminals CSC field wiring terminal strip and Input Conditioning Mod ule Terminal Board H7 Aux Out terminal strip and the CSC field wiring terminal strip Note The MCB Aux Out connector plug terminals displace wire insulation to make contact with the con ductor If a faulty Aux Out connections is suspected try pressing down on the wire in the
77. the physical layout of the network s communications trunk Go to the last controller on one end of the daisy chain and place a jumper across the and termi nals Then go to the last controller on the other end of the daisy chain and use an ohmmeter to test for conti nuity across the and terminals Remove the jumper and repeat this step for the other two conductor pairs to ground and to ground If there is continuity for each conductor pair the wir ing is continuous and it is likely but not guaranteed that the terminations are correct throughout the trunk If there is no continuity for one or more conductor pairs there may be a break in the trunk or the termi nations at one or more controllers may have been mixed up Table 13 Port B Voltages AMP Type Connector Pp 4 3 0 0 3 Vde C ee ee 2 0 0 3 Vde 0 0 0 2 Vde Table 14 Network Communications Field Wiring Terminals ae b yon S __ Grouwa T1 1 B Figure 22 AMP Connector Terminal Configuration PORT A COMMUNICATIONS FUSE BUSSMAN MCR 1 4 PORT B Level Controller Connection In order for the chillers and other level 2 controllers in a network to connect and communicate with the CSC the CSC is connected first 1 Set the network address to 00 level 1 See Address ing the Controllers above for more information 2 Push the circuit breaker CB1 but
78. to a level 2 controller that controller should have as low an address as possible A level 2 CSC should also have as low an address as possible This will improve the performance of network communications because it will reduce the required value of the level l CSC s Total Slaves parameter and thus the amount of polling For example if a modem is connected to Chiller 2 for CSC B in the above example you should consider setting the hex switches for CSC B to 01 and the hex switches for its Chiller 2 to 02 See the CSC and Chiller Controller Initial Setup section in Bulletin No OM 127 Minimum Controller Setup The CSC and the centrifugal reciprocating or screw chiller unit controller require a minimum of setup before the net work can be commissioned For complete information on how to do this see the CSC and Chiller Controller Initial Setup section in Bulletin No OM 127 Connecting the Communications Trunk Use the following three procedures to connect the and chiller controllers to the network Communications Cable Check The network communications cable should have been installed in accordance with the instructions in the Field Wiring section of this manual This procedure will verify that there are no shorts or stray voltages anywhere in the communications trunk Before beginning verify that the port B connectors are disconnected from every controller on the trunk 1 Verify that t
79. to use a CSC with older chillers that have incompatible standard software the chiller software must be upgraded This applies to all series 100 centrifugal chillers If you have a version of chiller software that is later than the compatible programs shown in Table x it is likely that program CSC1 01 is compatible with it however it may not be To find out for sure contact McQuayService File Names In all cases the file names of the compatible programs shown in Table x are the same as the program codes ex cept that they also include a COD extension For example the file for program PC209A is called PC209A COD as bet rA a zd Series ZOO Centrifugal PDRO8 and earlier PDMO9A PDM08 and earlier Series 100 Centrifugal Control Proc PC209A PC409A PC509A Reciprocating RCP1 01B RCP2 018 none Screw SC2 18D C24 18D SC3 18C SC34 18C Page 12 IM618 Accessories The accessories for the CSC allow for additional analog inputs analog outputs digital inputs and digital outputs The components that make these additional inputs and outputs possible are the Input Conditioning Module ICM the Analog Output Expansion Module AOX 4 and the Solid State Relay Kit SSR The modem kit is an option that allows remote or off site PC monitoring and control of the CSC when used with Monitor software See Table 9 for the installation manuals on the different accessories Table 9 Accessories Installation Manu
80. ton to power up the CSC and verify that there is power to the MCB by ob serving the LEDs 3 Check the voltages of port B on field wiring terminals T11 Use a DC voltmeter to test for proper voltages With the ground lead on the control panel chassis ground check the voltage at the and ground terminals Refer to Table 13 for the correct voltage levels If no voltage or improper voltage levels are found verify that the panel is energized 4 Plug the network communications AMP connector into port B Level 2 Controller Connection This procedure will verify that proper communications have begun for each controller as it is connected to the network You can connect the level 2 controllers in any order how ever it is better to follow the daisy chain as you proceed This will make troubleshooting easier if communications problems occur As a result of the previous procedures the network communications connector should be disconnected from the B port at every controller on the trunk except for the CSC Be sure that this is true before beginning this procedure For communications to occur each networked controller must have the proper hex switch setting and the proper voltages at its port B terminals 1 Set the network address hex switch setting to match the address on the engineering schedule Each con troller must have a unique address 2 Turn on power to the level 2 controller Refer to the control
81. ure transducer al lows the CSC to modulate a bypass valve as required to maintain an adjustable differential pressure setpoint When variable speed secondary pump control is used the chilled water loop differential pressure transducer al lows the CSC to maintain a desired pressure across the chilled water loop using PI proportional integral control When sequenced secondary pump control is used the chilled water loop differential pressure transducer allows the CSC to maintain a constant pressure difference be tween the secondary and return lines External Demand Limiting Signal An external l 5 Vdc 2 10 Vdc or 4 20 mA signal can be used to provide demand limiting for all chillers included in a CSC network Demand limiting prevents chillers from operating above a specified capacity RLA for centrifugal stages for recip rocating and screw As the demand limiting signal varies between l 5 Vdc 2 10 Vdc or 4 20 mA the RLA or maximum number of stages available in each chiller varies For more on demand limiting refer to Demand Limiting in the Load Limiting Control section of Bulletin No OM 127 MicroTech Chiller System Controller External Chilled Water Reset Signal The external reset option resets each chillers leaving evaporator water temperature according to a l 5 Vdc 2 10 Vdc or 4 20 mA signal If the external reset signal is less than or equal to 4 mA 1 Vdc the System Setpoint will equal the Minimum Sys
82. vel 2 controller a level 1 controller must be set up to poll that level 2 controller so that the PC will have access to the entire network For information on how to set up the level I controller to poll the level 2 controller see the operation manual for the par ticular controller being used Direct Connection An RS 232 communications cable kit allows a PC to directly connect to any MicroTech controller It is available from McQuay International The cable has a female DB9 connector for connection to the PC s 9 pin serial port If the PC has a 25 pin serial port obtain an adapter The cable length is 12 feet If more length is required a twisted shielded pair cable can be spliced into the kit cable see Cable Specification below If this is done splice the con ductors with crimp type butt connectors better or solder best Figure 17 RS 232 Cable Pinouts for 9 pin Serial Ports AMP Connector Female DB 9 Pin DCD Do not use wire nuts The maximum allowable cable length for direct connection between the PC and a controller is 50 feet If additional length is needed an RS 232 Cable Ex tension Kit P N 0065487001 is available from McQuay see Bulletin No IM 482 Remote Connection An analog direct dial telephone line is required for remote or off site PC access to the network The phone line should be terminated with a standard RJ 11 modular phone plug A modem enables a remote or off si
83. witch settings be tween 01 and 40 64 decimal There must be no gaps in the level 2 hex switch sequence and no duplicate settings The Typical Network The typical network includes one CSC and one to eight centrifugal reciprocating or screw chillers or a combina tion of up to eight centrifugal reciprocating or screw chill ers It may also include other level 2 unit or auxiliary controllers that could be accessed with a PC via network communications In this case the CSC is the level l con troller and the unit controllers are level 2 controllers Since the CSC is level 1 its hex switch setting must be 00 The hex switch settings of the level 2 controllers must start at 01 and continue consecutively to a maximum of 40 decimal 64 There must be no gaps in the sequence and no dupli cate settings As long as these rules are followed a level 2 controller s hex switches can be set to any value To keep the system simple you should consider addressing the chillers according to their designations IM 618 Page 25 For example assume that a MicroTech network includes a CSC two centrifugal chillers two screw chillers and one rooftop unit One possible addressing scheme is as follows Hex Switch Setting Controller 00 CSC 01 Chiller 1 centrifugal 02 Chiller 2 centrifugal 03 Chiller 3 screw 04 Chiller 4 screw 05 Rooftop air handling unit Note If a PC or modem is connected to a level 2 controller that controll
84. y pad display go to menu 3 Chiller Status Select the chiller number that is being connected to the CSC If communications is exists the screen will fill in with in formation about the chiller If you get a Comm Loss message communications between the CSC and chiller has not been accomplished For more informa tion on the keypad display refer to Getting Started in Bulletin No OM 127 To verify communications using Monitor for Windows software network diagnostics must be performed To run network diagnostics select the pull down menu Comm Select Network Diagnostic which will then display the Network Diagnostics Parameters Setup dialog box Using the Network Diagnostics Parameters Setup dialog box you can choose to continually loop the diagnostics or have a single sweep of each controller being connected to the network You can also perform the following functions Display Program ID and status Restrict display of level 3s to units with errors Clear communications errors if found Log errors to file Page 28 IM 618 As the different controllers are connected to the network their information is displayed on the Network Diagnostic Error Display screen By looking at the headings labeled Address and Error Codes network communications to a particular controller can be veri fied If there are no error codes network communica tions to the controller was successful If the

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